The most common and most likely answer to this crossword clue is the 6 letter word STEAMY
I've seen this crossword clue in The Times
S
T
E
A
M
Y
More clues leading to the result STEAMY
- Erotic extremes in story about sporty group
- Raunchy crew in outskirts of Salisbury
- Lubricious bunch in case of skullduggery
- Like a sauna group found in outskirts of Shrewsbury
- Unfortunately, my seat is hot
- Group in the outskirts of Stepney getting hot and damp
- Side wearing skirts of sky blue
- Free seat, I say, for adults?
- Erotic pinch missing bottom: Good gracious!
- Sexy old girlfriend going for outfit that’s blue
Buddy explains!

The straight part
We know that "Like a sauna" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case like a sauna = steamy.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does STEAMY mean?
STEAMY adjective- Warm and humid; full of steam
- Resembling or characteristic of steam
- Erotic